Dong-hyun is a high school student. One day, he falls from the rooftop and bumps into Pan-soo who is a passerby. Pan-soo is a member of a criminal organization. When the two men wake up in the hospital, they discover that they have switched bodies.
Six months ago the son of the married couple drowned. The couple, together with the teenager that their son saved, begin a journey to cope with the loss.
High school student Sung Jin commits suicide after being the victim of school violence for a long time. Three years later, one of his bullies Han Yeo Wool debuts as a celebrity. Sung Jin's brother, Sung Hyun, blames himself for not recognizing the pain his brother went through and finds a comment on Han Yeo Wool's news report that Sung Jin didn't commit suicide but was instead killed by Yeo Wool. The brother sets out to find the truth and he heads for destruction.
Lena (Park Gi Rim) is a Russian woman of Korean descent. Escaping a life of pain in Russia, she agrees to come to Korea as the bride of Soon Goo (Kim Jae Man), a farmer who lives in the rural countryside. Dealing with his own painful memories, Soon Goo is happy to just spend time with Lena as they go about their simple lives on the farm. But as Lena’s feelings for Soon Goo deepens, she finds it harder for her to stay.
Lee Ji Yeon has a natural, affirmative and bright personality and is a jewelry accessory designer. She is married to Choi Joon Ho. Kim Tae Seop is a dectective who is very quiet and is devoted to Ji Yeon after he falls in love with her. Ji Yeon is caught between two men.